duke@435: /*
duke@435:  * Copyright 1999-2003 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: class Atomic : AllStatic {
duke@435:  public:
duke@435:   // Atomically store to a location
duke@435:   static void store    (jbyte    store_value, jbyte*    dest);
duke@435:   static void store    (jshort   store_value, jshort*   dest);
duke@435:   static void store    (jint     store_value, jint*     dest);
duke@435:   static void store    (jlong    store_value, jlong*    dest);
duke@435:   static void store_ptr(intptr_t store_value, intptr_t* dest);
duke@435:   static void store_ptr(void*    store_value, void*     dest);
duke@435: 
duke@435:   static void store    (jbyte    store_value, volatile jbyte*    dest);
duke@435:   static void store    (jshort   store_value, volatile jshort*   dest);
duke@435:   static void store    (jint     store_value, volatile jint*     dest);
duke@435:   static void store    (jlong    store_value, volatile jlong*    dest);
duke@435:   static void store_ptr(intptr_t store_value, volatile intptr_t* dest);
duke@435:   static void store_ptr(void*    store_value, volatile void*     dest);
duke@435: 
duke@435:   // Atomically add to a location, return updated value
duke@435:   static jint     add    (jint     add_value, volatile jint*     dest);
duke@435:   static intptr_t add_ptr(intptr_t add_value, volatile intptr_t* dest);
duke@435:   static void*    add_ptr(intptr_t add_value, volatile void*     dest);
duke@435: 
duke@435:   // Atomically increment location
duke@435:   static void inc    (volatile jint*     dest);
duke@435:   static void inc_ptr(volatile intptr_t* dest);
duke@435:   static void inc_ptr(volatile void*     dest);
duke@435: 
duke@435:   // Atomically decrement a location
duke@435:   static void dec    (volatile jint*     dest);
duke@435:   static void dec_ptr(volatile intptr_t* dest);
duke@435:   static void dec_ptr(volatile void*     dest);
duke@435: 
duke@435:   // Performs atomic exchange of *dest with exchange_value.  Returns old prior value of *dest.
duke@435:   static jint     xchg    (jint     exchange_value, volatile jint*     dest);
duke@435:   static intptr_t xchg_ptr(intptr_t exchange_value, volatile intptr_t* dest);
duke@435:   static void*    xchg_ptr(void*    exchange_value, volatile void*   dest);
duke@435: 
duke@435:   // Performs atomic compare of *dest and compare_value, and exchanges *dest with exchange_value
duke@435:   // if the comparison succeeded.  Returns prior value of *dest.  Guarantees a two-way memory
duke@435:   // barrier across the cmpxchg.  I.e., it's really a 'fence_cmpxchg_acquire'.
duke@435:   static jbyte    cmpxchg    (jbyte    exchange_value, volatile jbyte*    dest, jbyte    compare_value);
duke@435:   static jint     cmpxchg    (jint     exchange_value, volatile jint*     dest, jint     compare_value);
duke@435:   static jlong    cmpxchg    (jlong    exchange_value, volatile jlong*    dest, jlong    compare_value);
duke@435:   static intptr_t cmpxchg_ptr(intptr_t exchange_value, volatile intptr_t* dest, intptr_t compare_value);
duke@435:   static void*    cmpxchg_ptr(void*    exchange_value, volatile void*     dest, void*    compare_value);
duke@435: };